Share this article Share this article NEW YORK, Dec. 28, 2020 /PRNewswire/ -- Halper Sadeh LLP, a global investor rights law firm, announces it is investigating the following companies: PRGX Global, Inc. (NASDAQ: PRGX) concerning potential violations of the federal securities laws and/or breaches of fiduciary duties relating to its sale to Ardian for $7.71 per share. If you are a PRGX shareholder, . Standard AVB Financial Corp. (NASDAQ: STND) concerning potential violations of the federal securities laws and/or breaches of fiduciary duties relating to its sale to Dollar Mutual Bancorp for $33.00 per share. If you are a Standard AVB shareholder, . NantKwest, Inc. (NASDAQ: NK) concerning potential violations of the federal securities laws and/or breaches of fiduciary duties relating to its merger with ImmunityBio. Under the terms of the agreement, ImmunityBio shareholders will receive a fixed exchange ratio of 0.8190 shares of NantKwest for each share of ImmunityBio owned. Upon completion of the transaction, ImmunityBio shareholders will own approximately 72% of the combined company and NantKwest shareholders will own approximately 28% of the combined company.